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01655 am a22001813u 4500 |
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77837 |
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|a Schweizer, T.
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|a Samson, B.N.
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|a Hector, J.R.
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|a Brocklesby, W.S.
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|a Hewak, D.W.
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|a Payne, D.N.
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|a Infrared emission and ion-ion interactions in thulium and terbium doped gallium lanthanum sulphide glass
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|c 1999.
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|u https://eprints.soton.ac.uk/77837/1/1740.pdf
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|a Infrared emission at 0.7, 0.8, 1.2, 1.5, 1.8, 2.3, 3.8, and 4.8µm is measured in thulium (Tm<sup>3+</sup>) and terbium (Tb<sup>3+</sup>) doped gallium lanthanum sulphide (GLS) glass. Emission cross sections are calculated from the absorption and emission spectra using Judd-Ofelt analysis, the Füchtbauer-Ladenburg equation, and the theory of McCumber. Fluorescence and lifetime measurements confirm energy transfer from Tm<sup>3+</sup> to Tb<sup>3+</sup> ions and reveal a number of new cross-relaxation/upconversion processes between Tm<sup>3+</sup> ions involving the <sup>3</sup>F<sub>2,3</sub> and <sup>3</sup>H<sub>5</sub> levels that can only be observed in low phonon energy materials. These processes indicate that the most efficient pump wavelength for the 1.2µm and 3.8µm transitions is 0.7µm. The Tm<sup>3+</sup> fluorescence at 3.8µm coincides with an atmospheric transmission window and the Tb<sup>3+</sup> fluorescence at 4.8µm overlaps with the fundamental absorption of carbon monoxide, making the glass a potential fibre laser source for remote sensing and gas sensing applications.
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